A model to study the effect of certification of planting material on the occurrence of leek rust     

P. D. de Jong 《European journal of plant pathology / European Foundation for Plant Pathology》1996,102(3):293-295

Based on a simple model, the possible effects of certification of planting material on the occurrence of leek rust in a region can be derived from information on the proportion of infected fields (v) and the proportion of newly planted fields with infected planting material (i) in that region. Ifv i, certification of planting material will be highly effective.  相似文献   

Inhibition of chitin synthesis by two 1-(2,6-disubstituted benzoyl)-3-phenylurea insecticides. II     

D.H. Deul  B.J. de Jong  J.A.M. Kortenbach 《Pesticide biochemistry and physiology》1978,8(1):98-105

The knowledge of the biochemical mode of action of 1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl)urea (diflubenzuron) is presented, explaining the insecticidal effect. Like its structural analog, 1-(2,6-dichlorobenzyl)-3-(3,4-dichlorophenyl)urea (Du 19111), it inhibits chitin synthesis in the cuticle of larvae. Virtually complete inhibition was demonstrable 15 min after the application of diflubenzuron. Neither diflubenzuron nor Du 19111 has any effect upon chitinase activity either in vivo or in vitro. The insecticidal effect upon the cuticle, therefore, must be explained as an inhibition of chitin synthesis and not as an activation of chitin degradation. In contrast to the action of Du 19111, no accumulation of N-acetylglucosamine occurs upon treatment of larvae with diflubenzuron. Similarities and differences in the mode of action of both compounds are discussed, together with other effects reported in the literature.  相似文献   

In vitro bactericidal activity of 465–470 nm blue light phototherapy and aminolevulinic acid on Staphylococcus pseudintermedius          下载免费PDF全文

Seulgi Bae  Taeho Oh 《Veterinary dermatology》2018,29(4):296-e102

  相似文献   

Association between weight change during initial chemotherapy and clinical outcome in dogs with multicentric lymphoma     

Wei‐Shan Lee  Jih‐Jong Lee  Albert Taiching Liao  Chia‐Lien Kao  Shang‐Lin Wang 《Veterinary and comparative oncology》2021,19(1):53-60

The majority of the known prognostic factors in dogs with lymphoma have been evaluated before treatment commences or at the time of diagnosis. Prognostic factors evaluated during the initial phase of treatment are less described but may provide important clinical information. In this retrospective study, 82 canine lymphoma patients were categorized according to the weight change between diagnosis and after 5 weeks of chemotherapy. Dogs that gained greater than 5% or lost greater than 5% of initial body weight were categorized as increased‐ or decreased‐weight groups, respectively. Those in which weight changed less than 5% were categorized as the maintained‐weight group. The median progression‐free survival (PFS) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 226, 256 and 129 days, respectively. The decreased‐weight group had significantly shorter PFS than the increased and maintained groups (P = .023, P = .003, respectively). The median survival time (ST) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 320, 339 and 222 days, respectively. There was no significant difference in ST among the three groups (P = .128). In Cox‐regression results, weight change group and initial body weight were significant risk factors associated to PFS (P = .007, P = .001, respectively) while only patient's initial body weight was a significant risk factor to ST (P = .013). In conclusion, evaluation of initial body weight and weight changes over time can provide valuable information regarding PFS and ST in dogs with multicentric lymphoma.  相似文献   

Distribution and habitat characteristics of three sympatric cetacean species in the coastal waters of Matang,Perak, Peninsular Malaysia     

Sui Hyang Kuit  Louisa Shobhini Ponnampalam  Jol Ern Ng  Ving Ching Chong  Amy Yee‐Hui Then 《水产资源保护:海洋与淡水生态系统》2019,29(10):1681-1696

Application of the rpoS gene for the detection of Vibrio anguillarum in flounder and prawn by polymerase chain reaction     

Kim DG  Bae JY  Hong GE  Min MK  Kim JK  Kong IS 《Journal of fish diseases》2008,31(9):639-647

Vibrio anguillarum , an opportunistic fish pathogen, is the main species responsible for vibriosis, a disease that affects feral and farmed fish and shellfish, and causes considerable economic losses in marine aquaculture. In this study, we used polymerase chain reaction (PCR) to detect V. anguillarum . PCR specificity was evaluated by amplifying the rpoS gene, a general stress regulator, in six strains of V. anguillarum and 36 other bacterial species. PCR amplified a species-specific fragment (689 bp) from V. anguillarum . Furthermore, the PCR assay was sensitive enough to detect rpoS expression from 3 pg of genomic DNA , or from six colony-forming units (CFU) mL⁻¹ of cultured V. anguillarum . However, the assay was less sensitive when genomic DNA from the infected flounder and prawn was used (limit of detection, 50 ng and 10 ng g⁻¹ tissue, respectively). These data demonstrate that PCR amplification of the rpoS gene is a sensitive and species-specific method to detect V. anguillarum in practical situations.  相似文献   

Kinetic Parameters of Gross N Mineralization of Peat Soils as Related to the Composition of Soil Organic Matter   总被引：1，自引：0，他引：1  

Bentio Heru Purwanto  Akira Watanabe  Jong Foh Shoon  Ken-ichi Kakuda  Ho Ando 《Soil Science and Plant Nutrition》2005,51(1):109-115

Peat land has been considered as an alternative type of land for agricultural development especially in the tropics. In the present study, the N-supplying capacity, one of the most important soil properties in terms of crop production, of peat soils was examined. Ten peat soil samples were collected from Indonesia, Malaysia, and Japan. Gross N mineralization in the soil samples was estimated using a zero-order model, and kinetic parameters of mineralization were determined using a simple type model. Soil organic matter composition was investigated using ¹³C CPMAS NMR. Mineralization potential ( N ₀), apparent activation energy ( E _a), and mineralization rate constant ( k ) ranged between 571–2,445 mg kg⁻¹, 281–8,181 J mol⁻¹, and 0.009–0.020 d⁻¹, respectively. Although none of the parameters showed a significant correlation with the soil C/N ratio, a negative correlation was observed between the k value and the ratio of the proportion of alkyl C in total C to that of O -alkyl C estimated by ¹³C CPMAS NMR. The latter suggested that the k values were higher in the peat soils relatively rich in readily decomposable organic matter including carbohydrates.  相似文献   

Improvement of water-stability of clay aggregates admixed with aqueous polymer soil stabilizers     

Jin Liu  Bin Shi  Hongtao Jiang  Sunyoung Bae  He Huang 《CATENA》2009,77(3):175-179

Aqueous soil stabilizers improve soil properties. Water-stability of soil aggregates was determined using two different soil stabilizers: S-type and E-type. Various concentrations of the two soil stabilizers were tested in soil aggregates that were bigger than 5 mm but smaller than 10 mm. Testing the aggregates using the static water-measure method showed that the water-stability index, K, increased with the concentrations of soil stabilizers. S-type soil stabilizer in concentrations ranging between 20% and 40% resulted in K-values between 64.0% and 83.8%, and E-type polymer emulsions in concentrations between 3% and 7% resulted in K-values between 90.1% and 99.7% respectively. The soil aggregates admixed with water resulted in a K-value of 11.5%, which was tested as a control. Two aggregate collapse models were found and discussed based on the collapse characteristics of the modified aggregates: S-type soil stabilizer in low concentrations follows a gradual collapse pattern, while S-type stabilizer in high concentrations and E-type stabilizer in low concentrations follow an explosive collapse pattern. These patterns depend on the formation of a membrane structure on the surface of the aggregates through physicochemical bonding. By identifying the mechanisms of the membrane structure and calculating the K-values, significant information on the improvement of soil properties can be determined.  相似文献   

Marker‐assisted breeding for improvement of anaerobic germination in japonica rice (Oryza sativa)     

Suk‐Man Kim  Choon‐Song Kim  Ji‐Ung Jeong  Russell F. Reinke  Jong‐Min Jeong 《Plant Breeding》2019,138(6):810-819

Direct seeding is increasingly being practiced in rice cultivation areas because it saves labour and reduces cost of production and management. In this study, four japonica‐type breeding lines were developed from a cross of a japonica cultivar and an AG‐tolerant donor, KHO, using marker‐assisted selection. Validation of the target genes AG1 and AG2 in the selected lines was examined by PCR analysis and the background recovery rate by the recurrent parent was confirmed by genotyping using a 6K SNP chip. Compared to the recurrent, the survival rates of the selected lines were improved in a range from 33% to 115% in three conditions; in particular, the survival rate was increased in more than twice that of the recurrent parent under the hypoxic condition. The main agronomic trait, yield and quality‐related traits were similar to those of the recurrent parent. The use of these lines will contribute to the expansion of the cultivation area due to the proven economic benefits of direct seeding in Korea.  相似文献   

Fabrication of electropsun PLGA and small intestine submucosa-blended nanofibrous membranes and their biocompatibility for wound healing     

Kihoon Kim  Jong Yoon Lee  Hyun Kim  Jaiho Shin  Yongwon Shin  Young Tai Yoo  Hwi-Yool Kim 《Fibers and Polymers》2017,18(2):231-239

In recent decades, tremendous research has focused on the production of nanoscale fibers using synthetic polymers, with the goal of fabricating nanofibrous scaffolds for wound healing. However, the hydrophobicity of such polymers typically hinders attachment and proliferation of the cells. In this study, we combined poly-d,l-lactide-co-glycolide (PLGA) and small intestine submucosa (SIS) to fabricate blended nanofibers for wound healing by electrospinning. PLGA and SIS were dissolved in 1,1,1,3,3,3-hexafluoro isopropanol to produce different weight ratios of PLGA/SIS-blended nanofibrous membranes (NFM). Physicochemical characterization of the electrospun NFM was performed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, water contact angle analysis, degradation test and tensile testing. The PLGA/SIS-blended NFM showed improved hydrophilicity and tensile strength. Better infiltration, attachment and proliferation of rat granulation fibroblasts of PLGA/SIS-blended NFMs compared to PLGA NFMs were identified by morphological differences determined by SEM and a water-soluble tetrazolium salt assay kit. Based on our results, the PLGA/SIS blended NFMs were found to be suitable for use as a potential material for wound dressing.  相似文献